Iteration means the act of repetition with improving the result’s accuracy each time by the knowledge gained from the previous one. simply it means the repetition of an action. Iteration starts with a defined initial conditions which is called an iterative step or a termination condition and cycles around.In contrast to the waterfaall, which has no chance to go back if there is a mistake , iterative model has iterations and if there is a problem this iteration gives possibility to user to evaluate the effectiveness, control and change each.
What does “sequential” mean?
Simply, sequential can be defined as a fixed order
Like sequence ,which means the ordered list of objects or events, sequential in science means a list of methods which is involved in testing a hypothesis is made to accept or reject the hypothesis or to continue sampling. In the type of development, the process and stages follow each other and do not allow us to move to the 2nd stage of development until we complete the first one. there is a close similarity of this model with the one of waterfall; however, it also differs from the iterative model since in sequential model it is important to complete one activity before passing the other one.
http://en.wikipedia.org/wiki/Sequential
http://wiki.answers.com/Q/What_is_sequential
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